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samsung galaxy s 2 auto shutdown problem

hi guys

i had bought sgs 2 about 3 weeks ago..it worked very nice but after 2 week it start automatically shut down at least thrice a day.... i also went to samsung costumer center they format my OS and reinstall it... but does effect much now it automatically shut down twice a day what should i do is it a software or hardware problem....pls help me what should i do??????